Global Patent Index - EP 3475522 B1

EP 3475522 B1 20240522 - DOWNHOLE DRILLING SYSTEM

Title (en)

DOWNHOLE DRILLING SYSTEM

Title (de)

BOHRLOCHBOHRSYSTEM

Title (fr)

SYSTÈME DE FORAGE DE FOND DE TROU

Publication

EP 3475522 B1 20240522 (EN)

Application

EP 17731924 A 20170627

Priority

  • EP 16176632 A 20160628
  • EP 2017065754 W 20170627

Abstract (en)

[origin: EP3263829A1] A downhole drilling method comprises providing a drill string (1) having a first part (5) and a second part (6), the first part having a drilling head (9) in a first end and an annular barrier (10). The annular barrier comprises a tubular metal part (11) surrounded by an expandable metal sleeve (14). The method furthermore comprises detecting the formation pressure to determine any loss of formation pressure; stopping the drilling; dropping a ball (32) into the drill string; pressurising the drill string until the ball reaches a ball seat (20) at the annular barrier; expanding the expandable metal sleeve until it abuts the inner face of the borehole; separating the second part of the drill string from the first part; pulling the second part out of the borehole; and injecting cement into the borehole above the first part to provide a cement plug above the first part.

IPC 8 full level

E21B 33/127 (2006.01); E21B 7/20 (2006.01); E21B 17/06 (2006.01); E21B 33/12 (2006.01); E21B 33/124 (2006.01); E21B 33/13 (2006.01)

CPC (source: EP US)

E21B 7/20 (2013.01 - EP US); E21B 17/06 (2013.01 - EP US); E21B 21/08 (2013.01 - EP US); E21B 33/1208 (2013.01 - EP US); E21B 33/1243 (2013.01 - EP US); E21B 33/127 (2013.01 - EP US); E21B 33/13 (2013.01 - EP US); E21B 33/14 (2013.01 - US); E21B 47/06 (2013.01 - US)

Citation (examination)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

EP 3263829 A1 20180103; AU 2017291178 A1 20190214; AU 2017291178 B2 20200130; BR 112018075687 A2 20190402; CA 3027777 A1 20180104; CN 109312607 A 20190205; EP 3475522 A1 20190501; EP 3475522 B1 20240522; EP 4397838 A2 20240710; MX 2018016143 A 20190829; RU 2019100629 A 20200728; RU 2019100629 A3 20201016; US 10626700 B2 20200421; US 2017370179 A1 20171228; WO 2018001984 A1 20180104

DOCDB simple family (application)

EP 16176632 A 20160628; AU 2017291178 A 20170627; BR 112018075687 A 20170627; CA 3027777 A 20170627; CN 201780037182 A 20170627; EP 17731924 A 20170627; EP 2017065754 W 20170627; EP 24177084 A 20170627; MX 2018016143 A 20170627; RU 2019100629 A 20170627; US 201715634105 A 20170627